A4091 Zorro III SCSI controller: board, 53C710 register model, minimal SCRIPTS engine#123

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Commits on Jul 5, 2026

a4091: Zorro III board scaffolding with nibble-wide autoboot ROM

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a4091: CTEST5 ADCK/BBCK test strobes

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serial: bidirectional TCP sink (mode = "tcp")

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a4091: CTEST1 reads FIFO-empty at reset

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a4091: DMA FIFO model and ISTAT software reset

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a4091: SCSI FIFO model with generated parity

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a4091: interrupt plumbing (ISTAT/DSTAT/SSTAT0/DIEN/SIEN)

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a4091: minimal SCRIPTS engine (register write, RETURN, INT)

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a4091: SCRIPTS Memory Move, incl. the board's own register window

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a4091: SCRIPTS fetch/move diagnostics (COPPERLINE_DIAG_A4091)

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